There are four types of mob passive, hostile,neutral and boss. Boss and hostile are dangerous and will attack even if your not doing anything to them.Neutral will attack if they are attacked. Passive won't attack even if you hit them
Those are ender dragons.
This is a video of all the mobs exept the spider jocky, wither and witch.
The ender dragon is my favourite mob the wither is my second and my third is the zombie pig man.
dangerous mob tatics
=run up to you and hit you
=shoot with a bow and arrow
=run up to you and go
=run up to you and head-butt you
=shoots fire balls at you
=same as normal spider
=same as blaze
=bounces to you then bounces and comes down on you